Portable crucible-furnace.



PATENTED OCT. 15, 1907.

M. HARVEY. PORTABLE GRUGIBLE FURNACE.

APPLICATION IILBD MAY 18, 1907.

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THE NORRIS PETERS cm, wasHmcmm-m c.

No. 868,181. PATENTED OUT. 15, 1907.

M. HARVEY.- PORTABLE GRUGIBLE FURNACE.

APPLIOATION FILED MAY 18, 1907.

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PATENTED OCT. 15, 19-07.

PORTABLE ORUCIBLE FURNACE.

APPLIOATION FILED MAY 18, 1907- 3 SHEETS-SHEET 3.

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W w WM 91%? arr MATTHEW HARVEY, OF WALSALL, ENGLAND.

PORTAB LE CRUGIB LEI-FURNACE Specification of Letters Patent.

Patented. Oct. 15, 1907.

Application filed May 18, 1907. Serial No. 374,461.

To all whom it may concern:

Be it known that I, hIATIHEW HARVEY, a subject of His Majesty the Kingof Great Britain and Ireland, and residing at Walsall, in the county ofStafford, England, managing director of Matthew Harvey & Co. Limitedhave invented new and useful Improvements in Portable Crucible-Furnaces,of which the following is a specification.

his invention has reference to portable crucible furnaces of the kind inwhich the furnace proper containing the crucible and the fuel forheating the same is arranged inside a cylindrical blast chamber which iscarried by side trunnions on a suitable traveling or other frame so thatthe furnace proper with the blast chamber can be tilted for pouring andcan also be turned upside down for examination of the bottom part of thefurnace which is made with blast inlets through which the blast passesfrom the blast chamber to the fuel in the interior of the furnace properround the crucible.

My present invention is designed to facilitate the opening of the lowerpart of the furnace and blast passages and cause the blast to beproperly diffused in the fuel space round the crucible and prevent itfrom impinging directly on to certain parts of the crucible and itssupport. I

I will describe my invention by referring to the accompanying drawingson which Figure l is a sectional side elevation of a portable cruciblefurnace embodying my invention; Fig. 2 is a side elevation of the samewith the bottom of the outer casing of the portable furnace lowered andthe furnace turned up side down for examination of the blast passages atthe bottom of the furnace proper; Fig. 3 is a plan of the furnace in theposition shown by Fig. 2.

a is the cylindrical blast chamber carried by side trunnions t which aremounted in bearings at the top of the side frames 0 of the travelingcarriage; these trunnions are as heretofore fitted with a side handle (Ifor tilting the furnace when pouring therefrom; e is the refractorylining of the furnace proper contained in the cylindrical casing fwhichis fixed inside the blast chamher a leaving an annular blast space {1which receives the blast through a side pipe h as heretofore.

f is the crucible mounted on a bottom block j which is carried by across bar lwhich is fixed to and stretches across the circular opening721. in the annular bottom plate n which is fixed to the casing f of thefurnace proper.

In carrying out my invention I provide on the bottom of the annularplate n, which as aforesaid is fixed to the bottom of the metal casingof the furnace proper, a series of projections o shaped so as to formV-shaped or other blast grooves or blast passages p so shaped andarranged that as the blast passes through them from the I. l f i blastchamber 9 in the direction indicated by the arrows in Figs. 1 and 3 theblast is divided up into various currents which impinge against oneanother as they.

crucible and the block on which it is mounted which as aforesaid haspreviously had .the effect of soon burning said block and crucible away.Fitting against the underside of these projections 0 there is a bottomplate q which is hinged at one side to the annular plate n-and forms thebottom of the furnace proper on which the coke rests and also the bottomof the blast grooves or channels p and this bottom plate q is secured tothe annular plate n by side catches r or by other suitable means, sothat when the furnace has been turned up side down on its trunnions asin Figs. Zand 3 this bottom plate q can be turned up as shown in thesefigures thereby opening the blast grooves p from which the olinkers orother obstructions can readily be removed. The bottom plate has acentral longitudinal slot s of the proper shape to clear the cross bar 1which carries the block j and crucible i.

In order to enable the bottom plate or and the blast channels p to bereadily examined as aforesaid, the bottom t of the outer casing of thefurnace is made like a metal dish with an upwardly projecting top rim inwhich the bottom of the outer casing a of the furnace fits and thisdished bottom it is guided for vertical movement by side pins u arrangedat the extremities of the diameter of the dish and fitting in verticalslots in brackets 11 fixed on the base of the carriage which car riesthe side frames 0 which support the trunnions b of the furnace. Belowthis dished bottom 15 is a rocking shaft 'w mounted in hearings on theunderside of the carriage and provided with two levers a: the ends ofwhich are by links y connected to the side pins to of the dished bottomplate t and this rocking shaft is provided with a side handle 2 by whichthe shaft can be turned and the dished bottom raised to receive thebottom of the body.

a of the furnace as in Fig. 1, so as to close the same and also hold thefurnace a in position and prevent it from tilting about its trunnions b.The handle 2 is locked in this position by any convenient means as by apeg taking against the handle and engaging in a hole in the side framec. When it is desired to pour the molten metal from the furnace, or toturn the furnace up side down, the dished bottom t can by the handle 2be moved down to its lowest position as in Fig. 2 where it will be clearof the furnace, and then the furnace being free to be revolved on itstrunnions b can be tilted for pouring, or as in Figs. 2 and 3 can beup-ended on its trunnions and the blast passages p examined as required.Moreover if the crucible in the furnace should break the contentsthereof will run through the-blast passages p into the dished bottom tfrom which, when the latter has been lowered as in Fig. 2, the metal canreadily be removed.

What I c1aim as my invention and desire to secure by Letters Patentis 1. A portable or self-contained crucible furnace containing acombined crusible chamber and air pro-heating chamber formed by an outershell mounted on side trunnions and provided with an annular bottomplate carrying the lining of the furnace proper said bottom plate havingprojections forming V-shaped blast passages which are closed by a hingedbottom plate which when the furnace is up ended on its trunnions can heturned up to enable the blast passages to be cleaned out, substantiallyas set forth;

i 2. The combination with a portable or self-contained crucible furnaceof the kind described of a dished bottom for the furnace said bottombeing guided for vertical I movement and provided with levers andconnections for moving it up or down so that when this dished bottom is20' I moved up it engages with the shell of the furnace and prevents thesame from turning; but when the dished bottom is moved down the furnaceis free to be turned l P about its trunnions for pouring or to up-end itfor exami- I nation 'of the blast passages.

I In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses.

MATTHEW HARVEY.

Witnesses Crmnnns Boswonrn Kn'rmir, THOMAS -JOIIN ROWE.

